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Status

This page documents the implementation status of various HTML and CSS features in Blitz.

CSS PropertiesHTML ElementsEventsWPT Tests

This page documents Blitz's scores on the "css" subsuite of the Web Platform Tests.

Note: As it does not have a JavaScript engine, Blitz can only run about 20% of the total subtests. In the numbers below, tests that Blitz can't run are ignored and percentages are relative to the number of tests run.

Data from commit:
708eb61 WPT runner: support mismatch reftests and multiple rel=match links (#665) (2026-08-09)

wpt / css / css-multicol / crashtests

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total100.00%(80/80)100.00%(80/80)100.00%
TestSubtestsSubtest %Status
as-baseline-aligned-grid-item.html(1/1)100.00%PASS
balance-break-inside-avoid-on-root.html(1/1)100.00%PASS
balance-with-forced-break.html(1/1)100.00%PASS
balancing-flex-item-trailing-margin-freeze.html(1/1)100.00%PASS
balancing-tall-borders-freeze.html(1/1)100.00%PASS
block-in-inline-with-spanner-in-overflowed-parent-nested-multicol.html(1/1)100.00%PASS
block-in-inline-with-spanner-in-overflowed-parent.html(1/1)100.00%PASS
break-before-multicol-caption.html(1/1)100.00%PASS
chrome-bug-1297118.html(1/1)100.00%PASS
chrome-bug-1303256.html(1/1)100.00%PASS
chrome-bug-1314866.html(1/1)100.00%PASS
first-letter-column-span-fieldset.html(1/1)100.00%PASS
fit-content-with-spanner-and-auto-scrollbar-sibling.html(1/1)100.00%PASS
float-beside-whitespace-ruby.html(1/1)100.00%PASS
float-multicol-crash.html(1/1)100.00%PASS
forced-break-in-oof-in-column-balancing-nested.html(1/1)100.00%PASS
forced-break-in-oof-in-column-balancing.html(1/1)100.00%PASS
inline-with-spanner-in-overflowed-container-before-multicol-float.html(1/1)100.00%PASS
interleaved-bfc-crash.html(1/1)100.00%PASS
margin-and-break-before-child-spanner.html(1/1)100.00%PASS
monolithic-oof-in-clipped-container.html(1/1)100.00%PASS
multicol-at-page-boundary-print.html(1/1)100.00%PASS
multicol-block-in-inline-crash.html(1/1)100.00%PASS
multicol-cached-consumed-bsize-crash.html(1/1)100.00%PASS
multicol-floats-in-ifc.html(1/1)100.00%PASS
multicol-parallel-flow-after-spanner-in-inline.html(1/1)100.00%PASS
multicol-table-caption-parallel-flow-after-spanner-in-inline.html(1/1)100.00%PASS
multicol-with-monolithic-oof-with-multicol-with-oof.html(1/1)100.00%PASS
multicol-with-oof-in-multicol-with-oof-in-multicol.html(1/1)100.00%PASS
negative-margin-on-column-spanner.html(1/1)100.00%PASS
nested-floated-multicol-with-tall-margin.html(1/1)100.00%PASS
nested-multicol-and-float-with-tall-padding-before-float.html(1/1)100.00%PASS
nested-multicol-and-float-with-tall-padding.html(1/1)100.00%PASS
nested-multicol-fieldset-tall-trailing-border-freeze.html(1/1)100.00%PASS
nested-multicol-fieldset-tall-trailing-padding.html(1/1)100.00%PASS
nested-multicol-in-svg-foreignobject.html(1/1)100.00%PASS
nested-multicol-nested-flex.html(1/1)100.00%PASS
nested-multicol-with-float-between.html(1/1)100.00%PASS
nested-oof-multicol-with-monolithic-child.html(1/1)100.00%PASS
nested-oof-multicol-with-oof-needing-additional-columns.html(1/1)100.00%PASS
nested-oof-multicol-with-padding.html(1/1)100.00%PASS
nested-spanner-with-negative-margin.html(1/1)100.00%PASS
nested-with-fragmented-oof-negative-top-offset.html(1/1)100.00%PASS
nested-with-multicol-table-caption.html(1/1)100.00%PASS
nested-with-multicol-table-cell.html(1/1)100.00%PASS
nested-with-percentage-size-and-oof.html(1/1)100.00%PASS
nested-with-tall-padding-and-oof.html(1/1)100.00%PASS
nested-with-tall-padding-and-spanner-and-content.html(1/1)100.00%PASS
nested-with-tall-padding.html(1/1)100.00%PASS
oof-in-nested-line-float.html(1/1)100.00%PASS
oof-in-oof-multicol-in-multicol-spanner-in-multicol.html(1/1)100.00%PASS
oof-in-oof-multicol-in-relpos-in-oof-in-multicol-in-multicol.html(1/1)100.00%PASS
oof-in-oof-multicol-in-relpos-spanner-in-multicol-in-relpos-multicol-in-multicol.html(1/1)100.00%PASS
oof-in-oof-multicol-in-relpos-spanner-in-spanner-multicol-in-multicol-in-multicol.html(1/1)100.00%PASS
oof-in-oof-multicol-in-spanner-in-multicol-in-spanner-in-nested-multicol.html(1/1)100.00%PASS
oof-in-oof-multicol-in-spanner-in-nested-multicol.html(1/1)100.00%PASS
oof-in-relpos-in-oof-multicol-in-oof-in-relpos-in-oof-multicol-in-multicol.html(1/1)100.00%PASS
oof-in-relpos-in-oof-multicol-in-relpos-in-oof-multicol-in-relpos-multicol.html(1/1)100.00%PASS
oof-in-spanner-in-relpos-in-multicol-in-relpos-multicol-001.html(1/1)100.00%PASS
oof-in-spanner-in-relpos-in-multicol-in-relpos-multicol-002.html(1/1)100.00%PASS
oof-nested-multicol-inside-oof.html(1/1)100.00%PASS
repeated-section-in-nested-table-nested-multicol.html(1/1)100.00%PASS
repeated-table-footer-in-caption-nested-multicol.html(1/1)100.00%PASS
restricted-height-bottom-border-overflow-and-spanner.html(1/1)100.00%PASS
scrollable-spanner-in-nested.html(1/1)100.00%PASS
spanner-after-parallel-flow.html(1/1)100.00%PASS
spanner-in-inline-after-very-tall-content-001.html(1/1)100.00%PASS
spanner-in-inline-after-very-tall-content-002.html(1/1)100.00%PASS
spanner-in-overflowed-clipped-container.html(1/1)100.00%PASS
spanner-in-overflowed-container-before-float.html(1/1)100.00%PASS
spanner-in-overflowed-container-before-inline-content.html(1/1)100.00%PASS
spanner-inside-inline-in-overflowed-container.html(1/1)100.00%PASS
specified-height-with-just-spanner-and-oof.html(1/1)100.00%PASS
sticky-in-abs-in-sticky.html(1/1)100.00%PASS
table-caption-in-clipped-overflow.html(1/1)100.00%PASS
text-box-trim-end-and-widows.html(1/1)100.00%PASS
text-in-inline-interrupted-by-float.html(1/1)100.00%PASS
trailing-parent-padding-between-spanners.html(1/1)100.00%PASS
vertical-rl-column-rules-wide-columns.html(1/1)100.00%PASS
zero-column-height.html(1/1)100.00%PASS